Xyle Scope

Xyle Scope was a CSS debugging tool for web designers that we developed in 2004.
It allowed you to inspect the whole cascade of applicable style rules for selected HTML elements.

Today, the functionality is superseded by Safari's web inspector.
We have stopped the development in 2007, and the product is no longer supported.
The last stable version can still be downloaded here. It might or might not work on your system.